Bradford White PDX-75S-70FB-3X User Manual
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Manual 238-49770-00B
SERVICE
MANUAL
Troubleshooting Guide
and Instructions for Service
(To be performed ONLY by
qualified service providers)
Models Covered
by This Manual:
PDX140S*F(BN,SX,CX)
PDX150S*F(BN,SX,CX)
PDX440S*F(BN,SX)
PDX450S*F(BN,SX)
PDX250T*F(BN,SX,CX)
PDX265T*F(BN,SX,CX)
PDX275T*F(BN,SX,CX)
PDX50S60F(B,S,C)*(N,X)
PDX65S65F(B,S,C)*(N,X)
PDX75S70F(B,S,C)*(N,X)
(*) Denotes Warranty Years
Powered Direct Vent Gas Water Heaters
PDX Series
Table of Contents
2
Page PDX Service Procedure
Introduction 4 - - -
How to use this manual 5 - - -
Tool required for service 5 - - -
Specifications 6 - - -
Control Timings 9 - - -
Sequence of Operation 10 - - -
Troubleshooting 13 - - -
Burner Inspection, Cleaning and Replacement 17 I
Pilot Testing, Cleaning and Replacement 19 II
Pressure Switch Testing and Replacement 20 III
Blower Testing and Replacement 22 IV
Blower Temperature Switch Testing and Replacement 24 V
Gas Control & Thermal well Testing & Replacement 26 VI
Flammable Vapor Sensor Testing & Replacement 30 VII
Safety Circuit Voltage Trace 31 VIII
115VAC Circuit Trace 32 IX
Dip Tube inspection and Replacement 33 X
Anode Inspection and Replacement 34 XI
Flue Baffle Inspection and Replacement 35 XII
Inner Door Removal, Inspection & Replacement 36 XIII
Glossary of Terms 40 - - -
Parts List 41 - - -
Page 2
PDX Series
3
WARNING: If the information in these instructions is
not followed exactly, a fire or explosion may result
causing property damage, personal injury, or death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use any
phone in your building.
Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
WARNING
Water heaters are heat producing appliances. To avoid
damage or injury, do not store materials against the
water heater or vent-air intake system. Use proper care
to avoid unnecessary contac
the water heater and vent-air intake components.
UNDER NO CIRCUMSTANCES MUST FLAMMABLE
MATERIALS, SUCH AS GASOLINE OR PAINT THINNER BE
USED OR STORED IN THE VICINITY OF THIS WATER
HEATER, VENT-AIR INTAKE SYSTEM OR IN ANY
LOCATION FROM WHICH FUMES COULD REACH THE
WATER HEATER OR VENT-AIR INTAKE SYSTEM.
t (especially by children) with
CAUTION
If sweat fittings are to be used DO NOT apply heat to the
nipples on top of the water heater. Sweat the tubing to
the adapter before fitting the adapter to the water
connections. It is imperative that heat is not appli
the nipples containing a plastic liner.
ed to
WARNING
Hydrogen gas can be produced in an operating water
heater that has not had water drawn from the tank for a
long period of time (generally two weeks or more).
Hydrogen gas is extr
possibility of injury under these conditions, we
recommend the hot water faucet to be open for several
minutes at the kitchen sink before you use any electrical
app
liance which is connected to the hot water system. If
hydrogen is present, there will be an unusual sound such
as air escaping through the pipes as hot water begins to
flow. Do not sm
emely flammable. To prevent the
oke or have open flame near the faucet
at the time it is open.
Incorrect operation of this appliance may
create a hazard to life and property and
will nullify the warranty.
Do not store or use gasoline or other
flammable, combustible, or corrosive
vapors and liquids in the vicinity of this
Before proceeding, please inspect the
water heater and its components for
possible damage. DO NOT install any
water heater with damaged components.
If damage is evident then please contact
the supplie
purchased or the manufacturer listed on
the rating plate for replacement parts.
DANGER
or any other appliance.
IMPORTANT
r where the water heater was
WARNING
CAUTION
DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU
ARE NOT CERTAIN OF THE FOLLOWING:
Liquefied petroleum gases/propane gas and natural gas
have an odorant added by the gas supplier that aids in
the detection of the gas.
Most people recognize this odor as a “sulfur” or “rotten
egg” smell.
Other conditions, such as “odorant fade” can cause the
odorant to diminish in intensity, or ”fade”, and not be
as readily detectable.
If you have a diminished sense of smell, or are in any
way unsure of the presence of gas, immediately contact
your gas supplier from a neighbor's telephone.
Gas detectors are available. Contact your gas supplier, or
plumbing professional, for more information.
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED 3/4” X
3/4” TEMPERATURE AND PRESSURE RELIEF VALVE WILL
RELEASE THE MANUFACTURER FROM ANY CLAIM THAT
MIGHT RESULT FROM EXCESSIVE TEMPERATURE AND
PRESSURES.
CAUTION
Turn off or disconnect the electrical power supply to the
water heater before servicing. Label all wires prior to
disconnection when servicing controls. Wiring errors can
cause improper and d
operation after servicing.
angerous operation. Verify proper
Page 3
PDX Series
4
The new Bradford White PDX1, PDX2 and PDX4 water heaters are designed to provide
reliable performance with enhanced standard features. New design features include reliable
spark to pilot ignition system, enhanced diagnostics, simplified servicing, significantly quieter
operation, additional vent lengths and certified FVIR technology.
Spark to Pilot Ignition System - employing the spark to pilot ignition system promotes
reliable and consistent pilot and main burner ignitions to provide hot water on demand.
Integrated Immersion Thermostat/Gas Control Valve with LED - was developed for ease
of troubleshooting by providing simple diagnostic codes to pinpoint an installation or
component performance issue.
New Powerful Blower - will eliminate problems with difficult venting situations.
Quieter and Cooler Blower Operation - blower noise is significantly reduced for both
interior and exterior environments. Cooler operation increases blower life by reducing bearing
wear and noise.
Rugged Wiring Connections - receptacle type connections promote error free wiring.
Introduction
Increased Vent Lengths - increased venting performance is achieved while maintaining
Energy Factor & FHSR performance.
The PDX1, PDX2, and PDX4 water heaters use a combustion system were flue gases are
combined with dilution air to reduce the flue gas temperature in the blower, combustion air and
dilution air are drawn from outside the building. The diluted flue gases are evacuated to the
exterior through non metallic vent materials. The gas control maintains water temperature,
ignition sequence and regulates gas flow. A safety circuit consisting of a pressure switch and
blower temperature switch verifies proper conditions exist for safe and reliable operation. If a
situation outside of normal operating parameters exists, the gas control diagnostic LED will
flash a code to positively identify an operational issue.
This service manual is designed to facilitate problem diagnosis and enhance service efficiency.
To further promote quicker service times the new gas valve can be removed and replaced
without draining the water heater. A special tool is required and will be provided with each gas
valve kit shipped from our Service Parts department.
Please read the service manual completely before attempting service on this new series of
power vent models.
How the Safety System Works
During normal operation, air for combustion is drawn into the water heater though the vent pipe from outside your
building. The air travels into the closed combustion chamber. The air then mixes with in a normal manner with
supplied gas and its efficiently combusted, producing very low NOx emissions.
In the unlikely event trace amounts of flammable vapors are present in the area surrounding the water heater, the
sealed combustion system prevents the flammable vapors from reaching the ignition source. In addition the
flammable vapors sensor will stop the water heater from operating if a significant amount of flammable vapors are
present.
Page 4
How to Use This Manual
5
PDX Series
It is intended for this manual to be used by qualified service personal for the primary purpose of
troubleshooting and repair of the Bradford White PDX Series water heaters. Understanding the
sequence of operation section of this manual will contribute greatly to troubleshooting the water
heater.
The Honeywell WV4460E Electronic Gas Control will display error codes in the event of abnormal
operation. Error codes are listed in the troubleshooting chart beginning on page 12 of this service
manual. The troubleshooting chart will also indicate the probable cause for the error code and
direct the service professional to a service procedure to properly diagnose the abnormal operation.
In some difficult to diagnose conditions, it may be necessary to isolate the heater from the vent
system to determine the problem.
Contact the Bradford White technical support group immediately if diagnosis can not be made
using the methods described in this service manual.
Tools Required for Service
Manometer:A liquid “U” tube type or a digital (magna-helic) type can be used. This
device is used to measure gas and/or air pressure and vacuum.
Multi-Meter:A digital type is strongly recommended. This device is used to measure
electrical values. The meter you select must have the capability to
measure volts AC, volts DC, Amps, micro-amps and ohms.
Electronic Probes: In some cases, standard multi-meter probes will damage or simply
not be effective to obtain certain voltage and ohm reading. It will be
necessary to have special electronic “pin” type multi-meter probes.
These probes are available at most electronic wholesale outlets.
Thermometer: Used to measure water temperature. An accurate thermometer is
recommended.
Water Pressure Gage: Used to measure water supply pressure. Also used to determine tank
pressure by adapting to the drain valve of the heater.
Gas Control Service Tool: BWC part number 239-45991-00. A specialized tool designed to remove
the gas control from gas control thermal well. Available from
your Bradford White parts supplier.
Various Hand Tools:Pipe wrench, channel locks, open end wrenchs (3/8",7/16",½"),
12" crescent wrench, Allen wrench set, screw drivers (common &
Phillips), ¼" nut driver, pliers (common & needle nose), socket set, side
cutters wire cutters, wire strippers, wire crimpers, torpedo level, small
shop vac, step ladder, and flashlight, 5 gallon pail.
Page 5
PDX Series
6
Power supply Dedicated 115VAC, 60 Hz, 15A
Gas Supply Pipe Minimum 1/2" NPT (schedule 40 black iron pipe recommended)
Approved Gas Type Natural or Propane. Unit must match gas type supplied.
Gas Pressure 5.0" W.C. min. for Nat gas, 11.0" W.C. min. for L.P. gas, 14.0" W.C. maximum (Nat. & L.P.)
Venting System Power direct vent through the wall or vertical through the roof
Approved Vent Materials PVC, CPVC or ABS
Minimum Clearance
for Servicing
Water Supply Pressure 150 PSI maximum allowable working pressure. Check local codes for supply pressure
Thermal well TCO Limit Residential 188°F (87°C), Commercial 199°F (93°C)
Residential Temperature
Set Point Range
Commercial Temperature
Set Point Range
18" from top, 24" from front, 4" sides and rear.
60°F (16°C) to 160°F (71°C) (Approximate temperatures)
80°F (27°C) to 180°F (82°C) (Approximate temperatures)
Specifications
Blower Temperature Switch Normally closed, opens @ 155°F (68°C), auto reset @ 128°F (54°C).
Standard Altitude-Normally open, closes at differential pressure of -.80.
Pressure switch
High Altitude-Normally open, closes at differential pressure of -.73.
Blower 115VAC, 60Hz, 3.1 amps.
Page 6
PDX Series
7
Specifications
Venting Specifications for:
48 Gallon
65 Gallon
75 Gallon
This water heater is approved for installation with the following PVC, CPVC or ABS
Schedule 40 venting material.
The maximum and minimum vent lengths listed on this label are for the exhaust portion of
the vent. The intake portion of the vent must be equal to or less than the length of the
exhaust.
Vent Tables
3" Diameter (7.6 cm) PVC Vent Connector Lengths
Maximum 75 gal.Maximum 48, 65 gal.
Terminating
Through the Wall
Through the Wall 2 50 (15.2) 2 (.6)
Through the Wall 3 45 (13.7) 2 (.6)
Through the Wall 4 40 (12.2) 2 (.6)
Through the Roof 0 60 (18.3) 7 (2.1)
Through the Roof 1 55 (16.8) 7 (2.1)
Through the Roof 2 50 (15.2) 7 (2.1)
Through the Roof 3 45 (13.7) 7 (2.1)
# of
Elbows
Maximum
Length ft (m)
Length ft (m)
1 55 (16.8) 2 (.6)
Minimum
Maximum
Length ft (m)
Minimum
Length ft (m)
45 (13.7) 2 (.6)
40 (12.2) 2 (.6)
35 (10.7) 2 (.6)
30 (9.1) 2 (.6)
50 (15.2) 7 (2.1)
45 (13.7) 7 (2.1)
40 (12.2) 7 (2.1)
35 (10.7) 7 (2.1)
4" Diameter (10.2 cm) PVC Vent Connector Lengths
Terminating
Through the Wall
# of
Elbows
Maximum
Length ft (m)
Minimum
Length ft (m)
1 95 (29.0) 10 (3.1)
Through the Wall 2 90 (27.4) 10 (3.1)
Through the Wall 3 85 (25.9) 10 (3.1)
Through the Wall 4 80 (24.4) 10 (3.1)
Through the Wall 5 75 (22.9) 12 (3.6)
Through the Roof 0 100 (30.5) 15 (4.6)
Through the Roof 1 95 (29.0) 15 (4.6)
Through the Roof 2 90 (27.4) 15 (4.6)
Through the Roof 3 85 (25.9) 15 (4.6)
Through the Roof 4 80 (24.4) 15 (4.6)
Maximum 75 gal.Maximum 48, 65 gal.
Maximum
Length ft (m)
Minimum
Length ft (m)
85 (25.9) 10 (3.1)
80 (24.4) 10 (3.1)
75 (22.9) 10 (3.1)
70 (21.3) 10 (3.1)
65 (19.8) 12 (3.6)
90 (27.4) 15 (4.6)
85 (25.9) 15 (4.6)
80 (24.4) 15 (4.6)
75 (22.9) 15 (4.6)
70 (21.3) 15 (4.6)
Page 7
PDX Series
8
Part II-Venting Specifications for:
40 Gallon
50 Gallon
Specifications
Vent Tables
The minimum equivalent length for the exhaust portion of the vent is 7 feet. The maximum equivalent vent length for the exhaust is 35 feet
for 2" diameter pipe and 85 feet for 3" diameter pipe. The intake portion of the vent must be equal to or less than the vent length of the
exhaust. The tables below are provided for your quick reference, some installations may require a greater number of elbows. When
calculating equivalent vent length, one 90° elbow is equivalent to 5 feet.
IMPORTANT
VENT CONNECTOR LENGTHS FOR 2" (5.1 cm) DIAMETER VENT PIPE
# of
Terminating
Through the Wall
Elbows
(excl. vent
term.)
1 30 (9.1)
Through the Wall 2 25 (7.6)
Through the Wall 3
Through the Wall 4 15 (4.6)
Through the Roof 0 35 (10.7)
Through the Roof 1 30 (9.1)
Through the Roof 2 25 (7.6)
Through the Roof 3 20 (6.1)
Maximum
straight
Length ft (m)
20 (6.1)
Minimum
straight
Length ft (m)
2 (.6)
2 (.6)
2 (.6)
2 (.6)
7 (2.1)
7 (2.1)
7 (2.1)
7 (2.1)
VENT CONNECTOR LENGTHS FOR 3" (7.6 cm) DIAMETER VENT PIPE
Terminating
Through the Wall
# of
Elbows
(excl. vent
term.)
1 80 (24.4)
Maximum
straight
Length ft (m)
Through the Wall 2 75 (22.9)
Through the Wall 3
70 (21.3)
Through the Wall 4 65 (19.8)
Through the Roof 5 60 (18.3)
Through the Roof 0 85 (29.9)
Through the Roof 1 80 (24.4)
Through the Roof 2 75 (22.9)
Through the Roof
Through the Roof
3 70 (21.3)
65 (19.8)4
Maximum
straight
Length ft (m)
10 (3.1)
10 (3.1)
10 (3.1)
10 (3.1)
10 (3.1)
15 (4.6)
15 (4.6)
15 (4.6)
15 (4.6)
15 (4.6)
Page 8
PDX Series
9
Control Timings
Pre-purge 15 Seconds
Trial for Ignition 90 Seconds
Flame Stabilization Period 3 Seconds
Inter-purge 15 Seconds
Flame Failure Response Time 1.5 Seconds (2 second. Maximum; 1 second minimum.)
Post-purge 15 Seconds
PS Fault Delay (failed open/close) Retry after 2 Minutes
Soft Lockout Retry after 5 Minutes
TCO Limit Lockout Indefinite (cycle power to restart)
Verify Resistive Delay Retry after 2 Minutes (repeats 5 times)
Simulated Resistive Load Lockout Indefinite (cycle power to restart)
Hardware Error Lockout Indefinite (self clears if fault clears for at least 15 seconds)
Specifications
Ignition State Timing
Page 9
PDX Series
10
1
Start Up.
Upon power up, the control runs a safe-start check with a typical start-up delay of 1-5 seconds.
2
Flammable Vapor Check.
To assure no outputs are energized if the “Flammable Vapor Sensor” is out of range, the control will test the
the “Flammable Vapor Sensor” for proper operating range. If the “Flammable Vapor Sensor” is within range the
control resumes normal operation with no perceptible delay. If the “Flammable Vapor Sensor” is out of range, the
control LED immediately flashes 7 times with 3 second pause.
1
Thermostat calls for heat.
Prior to energizing blower, gas control checks safety circuit to insure the circuit is open. Normal switch positions
in the safety circuit are as follows:
a) Exhaust pressure switch normally open.
b) Blower temperature switch normally closed.
If the safety circuit is closed, the control waits 4 seconds, gas control LED flashes 2 times with 3 second pause.
Gas control waits 2 minutes then, blower runs for 30 seconds. This cycle repeats until safety circuit opens.
Sequence of Operation
2
Blower energizes.
3
Blower pre-purge period (15 seconds)
4
Differential pressure switch proves blower/vent system operation.
a) If the pressure switch does not close within 30 seconds, the control LED Flashes 3 times with 3 second pause.
The blower runs for 30 seconds every 2 minutes trying to get the pressure switch or blower temperature
switch to close. This cycle repeats as long as there is a call for heat.
5
Trial for pilot ignition (90 seconds).
a) The gas control lights the pilot by activating spark igniter and gas flow to pilot burner.
b) If flame is not sensed within 90 seconds, igniter and gas flow are deactivated, blower will post purge and
control LED flashes 6 times with 3 second pause.
6
Main burner Ignition
After pilot flame is sensed, gas control activates main valve for main burner ignition. The gas control will ignore
flame and pressure switch signals for 3 seconds allowing for main burner to stabilize.
Page 10
PDX Series
11
Steady state operation.
7
8
Thermostat satisfies.
9
Burner off.
During Steady State Operation the Control Monitors:
Thermostat temperature sensor- When set point temperature is satisfied, gas valve is shut down and
blower will post purge for 15 seconds. Control LED flashes a short flash once every 4 seconds (idle) status
code.
Pressure switch / Blower temperature switch- If either switch opens, pilot valve and main valve is shut
down. The blower continues to run for 30 seconds attempting to close the circuit. The control LED Flashes
3 times with 3 second pause.
Flame Sense- If flame is lost, pilot & main valve are shut down, blower runs for 15 seconds. Control attempts
to re-light pilot 4 times. If unsuccessful, Blower is shut down and control proceeds to 5 minute lockout. Control
re-attempts to light pilot starting at normal heating sequence #2.
Sequence of Operation
10
Blower post purge (15 seconds).
1. Simulated Resistive Device Fault:
a) If the Flammable Vapor Sensor resistance is greater than 70,000 Ohms - the gas control immediately turns
off all outputs. Control waits and monitors resistance for 30 seconds. If the resistance is greater than 70,000 ohms
after 30 seconds, the gas control pro
second pause. This process is repeated 5 times until the control either returns to normal operation or proceeds
to a lockout mode flashing 7 times wi
b) If the Flammable Vapor Sensor resistance is below 3000 ohms - The gas control immediately turns off all
outputs and proceeds to flash 8 times then once with three second pause. The error self clears if the resistance
returns to nor
mal range for at least 15 seconds.
ceeds to verify resistive delay for 2 minutes and flashes 7 times with a three
th a 3 second pause.
2. Temperature Sensor Fault:
a) Temperature sensor detected open circuit - The gas control Immediately turns off all outputs and proceeds to
flash 8 times then three times with three second pause. The error self clears if the fault clears for at least 15
seconds.
b) Temperature sensors not reading the same
all outputs and proceeds to flash 8 times then three times with three second pause. The error self clears if the fault
clears for at least 15 seconds.
temperature within ±5.5 °F - The gas control Immediately turns off
c) Water temperature in excess of TCO (Temperature Cut Off) limit - The gas
main valve and proceeds to flash 4 times with 3 second pause. Blower continues to run until gas control is reset.
Power needs to be cycled to remove gas control from TCO lockout.
control immediately turns off pilot &
Page 11
Sequence of Operation
12
PDX Series
3. Pressure Switch/Blower Temperature Fault:
a) Pressure switch closed at start of call for heat - The control waits four seconds then, proceeds to flash
2 times with 3 second pause. The control waits 2 minutes and then turns on blower for 30 seconds. The blower
turns off after 30 seconds and the control waits for pressure switch to open. Any time the Pressure switch opens,
the blower turns on (or stays on) and the control proceeds to waiting for p
b) Pressure switch or blower temperature switch failed open - The control runs the blower for 30 seconds
waiting for the pressure switch and/or blower temperature switch to close. If either switch does not close in 30
seconds, the blower turns off and the control flashes 3 times with 3 second pause. The control waits two
minutes before turning on the blower for another 30 seconds to see the circuit close. This cycle re
there is a call for heat or until the circuit closes.
c) Pressure switch or blower temperature switch opens during burner operation - The control turns off the
pilot and main valve, runs blower for 15 seconds (inter-purge) waiting for pressure switch and/or blower
temperature switch to close. If either switch fails to close, the control proceeds as described in 3b above. If the
circuit closes again by the end of
not reached its limit (4), another trial for ignition begins. If the recycle count has been reached, the control
turns off the blower and flashes 6 times then 2 times with 3 second pause. The control waits 5 minutes before
repeating ignition sequence.
the inter-purge, the recycle counter is incremented, if the recycle count has
ressure switch to close.
peats as long as
4. Trial For Ignition Fault:
a) Pressure switch opens during trial - The control turns off igniter and pilot valve. The gas control proceeds
as described in 3b above. If the pressure switch closes within 30 seconds the gas control will continue with trial for
ignition starting at blower pre-purge.
b) Flame Not Sensed - The control energizes the spark igniter attempting to light the pilot and prove flame. If
f
lame is not sensed within 90 seconds, the igniter turns off, the pilot valve is closed and the gas control runs the
blower through post purge and flashes 6 times then once with 3 second pause. The control waits 5 minutes before
repeating the ignition sequence.
5. Flame Sensing Fault:
a) Flame lost during run - The control turns off pilot and main valves, runs blower for 15 seconds (inter purge).
The control increments the recycle count, if the recycle count has not reached its limit (4), another trial for
ignition begins. If the recycle count has been reached, the control turns off the blower and flashes 6 times
then 3 times with 3 second pause. The control waits 5 minutes before repeating the ignition sequence.
b) Flame s
present when the pilot valve is not open, the control proceeds to wait for flame loss and flashes 5 times with 3
second pause. This continues until flame is lost, once the flame signal is lost, the control flashes 6 times then 4
times with 3 second pause. The control waits 5 min
ensed out of sequence - the control only looks for pilot flame when the blower is running. If flame is
utes before repeating the ignition sequence.
Page 12
PDX Series
13
Troubleshooting
Observe green LED indicator on Electronic gas
control. Error flash codes are displayed with a
three second pause before repeating. Check
and repair the system as noted in the
troubleshooting table
below.
(For models with serial numbers starting with K or later see chart on page 15.)
LED Status
None, control LED not on
or flashing
Short flash, once every
four seconds
“Heartbeat”, alternates
bright/dim
Short flash once per
second
Control Status
No electrical
power
Stand-by mode,
Waiting for call for
heat (no fault).
Thermostat calling
for heat (no fault).
Weak pilot signal
on last call for heat.
Probable Cause
Control power switch in “OFF” position.
Supply voltage interrupted.
Temperature demand is satisfied
Tank temperature below set point of thermostat.
1. Unstable pilot.
2. Pilot tube block or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
Green LED
Indicator
Service
Procedure
Turn power on
Normal operation.
Adjust thermostat to
temp level
Normal operation.
Adjust thermostat to
temp level
1. Page 15
2-4. Page 17
Two flash, three second
pause
Three flash, three second
pause
Four flash, three second
pause
Five flash, three second
pause
Pressure switch not
working-closed
position.
Pressure switch or
blower temp.
switch not working
-open position.
Excessive tank
temperature.
System must be
reset.
Undesired-false
pilot flame present.
1. Pressure switch tubing kinked or blocked.
2. Blocked pressure tap on switch or blower.
3. Faulty pressure switch.
1. Vent blockage or improper vent configuration.
2. Pressure switch tubing kinked or blocked.
3. Faulty pressure switch.
4. Blower not spinning up to speed.
5. Blower temp or exhaust temp too high
6. F
aulty blower temperature switch.
7. Intake vent length exceeds exhaust vent length.
8. Frozen intake or exhaust vent terminal.
1. Thermal well sensor out of calibration.
2. Faulty gas control.
3. Plumbing leak
1. Pilot valve stuck in open position.
Page 18
1. Check vent or vent tables.
2 & 3 Page 18
4. Page 20
5 & 6 Page 22
8. Page 37
1. Page 24
2. Replace gas control,
page 26
Replace gas control,
page 26
Page 13
PDX Series
14
Troubleshooting
LED Status Control Status
Six-one flash, three
second pause
Six-two flash, three
second pause
Six-three flash, three
second pause
Six-four flash, three
second pause
Seven flash, three second
pause
Failed to light pilot.
System auto resets.
Pressure switch
or blower temp
switch opened
during burner
operation.
System auto
resets.
Pilot flame
extinguished.
System auto
resets.
Undesired-false
pilot flame
sensed.
System auto
resets.
Flammable Vapor
Sensor fault
detected
Probable Cause
1. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
1. Vent blockage or improper vent configuration.
2. Pressure switch tubing kinked or blocked.
3. Faulty pressure switch.
4. Vent termination being affected by wind
5. Blower not spinning up to speed.
6. Blower temp or
7. Faulty blower temperature switch.
8. Insufficient combustion air.
1. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
5. Insufficient combustion air.
6. Gas pressure is
Pilot valve stuck in open position.
WARNING: EXPLOSION HAZARD
* Indicates gasoline vapors were detected at potentially
explosive levels.
* Verify no gasoline vapors are still present
* Reset the control by cycling power to the appliance or
by cycling the ON/OFF switch
* Replace the Flammable Vapors Sensor element if a
gasoline spill event occurred.
exhaust temp too high
out of specification.
.
Service
Procedure
1. Page 15
2-4. Page 17
1. Check vent or vent tables.
2 & 3 Page 18
4. Refer to venting section of
installation manual
5. Page 20
6 & 7 Page 22
8. Refer to installation
manual.
1. Page 15
2-4. Page 17
5. Refer to installation manual
Replace gas control,
page 26
Page 28
Eight-one flash, three
second pause
Eight-three flash, three
second pause
Eight-four flash, three
second pause
Flammable Vapor
Sensor out of
specification.
Thermal well
sensor damaged
or unplugged
Gas valve
electronics fault
detected
Gas valve fault
detected.
* Verify Flammable Vapor Sensor (FVS) resistance is
not below 25 K Ohms.
* Check wiring to FVS and insure it is not shorted.
* Replace control if everything above checks out OK.
1. Damage to thermal well wire.
2. Thermal well sensor resistance out of range.
1. Control needs to be reset.
2. Control is wet or physically damaged.
1. Control needs to be reset.
2. Control is wet or physically damaged.
Page 28
Page 24
1. Interrupt power supply
2. Replace gas control,
page 26
1. Interrupt power supply
2. Replace gas control,
page 26
Page 14
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